I am looking for a specific fic I read a while ago where Jared is a Mafia Boss and has a son (who I think was face credit Colin Ford?). Jensen lives across the street from them but doesn't know them. The son knocks on the door one night because his dad (Jared) is being kidnapped/tortured by a rival mob and he needs help. Jensen decides to help because this kid is freaking out. We see Jensen rescue Jared and then flash forward to Jared telling him it was all a set up so that he could get close to Jensen and see if he was worthy of being in Jared and his son's family.

Jensen is really resistant and annoyed at first but eventually gives in. There is also a side story about Jensen's brother (who I believe was named Jamie?) and a lot of guilt because of something that happened earlier in their lives.

Chad Michael Murray is the son's body guard and I think Misha Collins is also a body guard. Jason Mamoa (I'm pretty sure) is Jensen's friend/tutor-ee.

The whole story ends with Jensen starting his first day at NASA or a few years after he has been working at NASA.